drivers/irqchip/irq-renesas-h8300h.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * H8/300H interrupt controller driver
   4  *
   5  * Copyright 2015 Yoshinori Sato <ysato@users.sourceforge.jp>
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/irq.h>
  10 #include <linux/irqchip.h>
  11 #include <linux/of_address.h>
  12 #include <linux/of_irq.h>
  13 #include <asm/io.h>
  14
  15 static const char ipr_bit[] = {
  16          7,  6,  5,  5,
  17          4,  4,  4,  4,  3,  3,  3,  3,
  18          2,  2,  2,  2,  1,  1,  1,  1,
  19          0,  0,  0,  0, 15, 15, 15, 15,
  20         14, 14, 14, 14, 13, 13, 13, 13,
  21         -1, -1, -1, -1, 11, 11, 11, 11,
  22         10, 10, 10, 10,  9,  9,  9,  9,
  23 };
  24
  25 static void __iomem *intc_baseaddr;
  26
  27 #define IPR (intc_baseaddr + 6)
  28
  29 static void h8300h_disable_irq(struct irq_data *data)
  30 {
  31         int bit;
  32         int irq = data->irq - 12;
  33
  34         bit = ipr_bit[irq];
  35         if (bit >= 0) {
  36                 if (bit < 8)
  37                         ctrl_bclr(bit & 7, IPR);
  38                 else
  39                         ctrl_bclr(bit & 7, (IPR+1));
  40         }
  41 }
  42
  43 static void h8300h_enable_irq(struct irq_data *data)
  44 {
  45         int bit;
  46         int irq = data->irq - 12;
  47
  48         bit = ipr_bit[irq];
  49         if (bit >= 0) {
  50                 if (bit < 8)
  51                         ctrl_bset(bit & 7, IPR);
  52                 else
  53                         ctrl_bset(bit & 7, (IPR+1));
  54         }
  55 }
  56
  57 struct irq_chip h8300h_irq_chip = {
  58         .name           = "H8/300H-INTC",
  59         .irq_enable     = h8300h_enable_irq,
  60         .irq_disable    = h8300h_disable_irq,
  61 };
  62
  63 static int irq_map(struct irq_domain *h, unsigned int virq,
  64                    irq_hw_number_t hw_irq_num)
  65 {
  66        irq_set_chip_and_handler(virq, &h8300h_irq_chip, handle_simple_irq);
  67
  68        return 0;
  69 }
  70
  71 static const struct irq_domain_ops irq_ops = {
  72        .map    = irq_map,
  73        .xlate  = irq_domain_xlate_onecell,
  74 };
  75
  76 static int __init h8300h_intc_of_init(struct device_node *intc,
  77                                       struct device_node *parent)
  78 {
  79         struct irq_domain *domain;
  80
  81         intc_baseaddr = of_iomap(intc, 0);
  82         BUG_ON(!intc_baseaddr);
  83
  84         /* All interrupt priority low */
  85         writeb(0x00, IPR + 0);
  86         writeb(0x00, IPR + 1);
  87
  88         domain = irq_domain_add_linear(intc, NR_IRQS, &irq_ops, NULL);
  89         BUG_ON(!domain);
  90         irq_set_default_host(domain);
  91         return 0;
  92 }
  93
  94 IRQCHIP_DECLARE(h8300h_intc, "renesas,h8300h-intc", h8300h_intc_of_init);